日志类库框架
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一个错误报告日志的框架,编译成动态库,不过功能还不够完善。
利用C++输出文件流的类ofstream 来实现日志记录功能:
使用ios::out和ios::app的方式打开(文件以输出方式打开(内存数据输出到文件);以追加方式打开文件)
private: __Log() { StreamObject.open( "刘大大.log", std::ios::out | std::ios::app ); } __Log(const __Log&) = delete; __Log& operator = (const __Log&) = delete; private: ofstream StreamObject;
效果:
源代码:
1 #pragma once 2 #include <windows.h> 3 #include <iostream> 4 #include <fstream> 5 #include <ctime> 6 #include <cstdio> 7 using namespace std; 8 enum _LOG_LEVEL_ 9 { 10 Fatal = 0, 11 Error, 12 Critical, 13 Warning, 14 Normal, 15 Verbose 16 }; 17 18 19 class __Log 20 { 21 public: 22 ~__Log(); 23 static __Log& Instance() 24 { 25 static __Log LogObject; 26 return LogObject; 27 } 28 29 BOOL __Log::RecordLogEx(_LOG_LEVEL_ LogLevel, const char* Format, ...); 30 BOOL __Log::RecordLog(_LOG_LEVEL_ LogLevel, const char* Format, va_list ParameterData); 31 private: 32 __Log() 33 { 34 //以输出方式打开(内存数据输出到文件);以追加的方式打开文件 35 StreamObject.open( "刘大大.log", std::ios::out | std::ios::app ); 36 } 37 __Log(const __Log&) = delete; 38 __Log& operator = (const __Log&) = delete; 39 40 private: 41 ofstream StreamObject; 42 };
1 #include "Common.h" 2 3 static const char* __LogLevel[] = { "*致命*", "*错误*", "*关键*", "*警告*", "*普通*", "*冗长*" }; 4 __Log::~__Log() 5 { 6 StreamObject << endl; 7 } 8 BOOL __Log::RecordLogEx(_LOG_LEVEL_ LogLevel,const char* Format, ...) 9 { 10 //初始化指向可变参数列表的指针 11 va_list ParameterData; 12 bool IsOk = FALSE; 13 //将第一个可变参数的地址付给ap,即ap指向可变参数列表的开始 14 va_start(ParameterData, Format); 15 IsOk = RecordLog(LogLevel, Format, ParameterData); 16 //ParameterData赋值为0,没什么实际用处,主要是为程序健壮性 17 va_end(ParameterData); 18 19 return IsOk; 20 } 21 BOOL __Log::RecordLog(_LOG_LEVEL_ LogLevel,const char* Format, va_list ParameterData) 22 { 23 char BufferData[2048] = { 0 }; 24 char MessageData[0x1000] = { 0 }; 25 char TimeData[256] = { 0 }; 26 27 auto TimeObject = time(NULL); 28 tm v1; 29 localtime_s(&v1, &TimeObject); 30 strftime(TimeData, _countof(TimeData), "%Y-%m-%d %H:%M:%S", &v1); 31 //将参数fmt、ap指向的可变参数一起转换成格式化字符串,放string数组中,其作用同sprintf,只是参数类型不同 32 vsprintf_s(BufferData, _countof(BufferData), Format, ParameterData); 33 sprintf_s(MessageData, _countof(MessageData), "%s %-5s %s", TimeData, 34 __LogLevel[LogLevel], BufferData); 35 36 StreamObject << MessageData << std::endl; //写入到日志 37 38 return true; 39 }
1 #pragma once 2 #include <windows.h> 3 #include <iostream> 4 #include <fstream> 5 #include <ctime> 6 #include <cstdio> 7 using namespace std; 8 9 enum _LOG_LEVEL_ 10 { 11 Fatal = 0, 12 Error, 13 Critical, 14 Warning, 15 Normal, 16 Verbose 17 }; 18 19 //用__declspec(dllexport)显式的定义dll接口给调用它的exe或dll文件, 20 class _declspec (dllexport) __Log 21 { 22 public: 23 __Log(); 24 ~__Log(); 25 static __Log& __Log::Instance(); 26 BOOL __Log::RecordLogEx(_LOG_LEVEL_ LogLevel, const char* Format, ...); 27 BOOL __Log::RecordLog(_LOG_LEVEL_ LogLevel,const char* Format, va_list ParameterData); 28 29 protected: 30 private: 31 std::ofstream StreamObject; 32 33 };
1 #include "Common.h" 2 3 BOOL APIENTRY DllMain( HMODULE hModule, 4 DWORD ul_reason_for_call, 5 LPVOID lpReserved 6 ) 7 { 8 switch (ul_reason_for_call) 9 { 10 case DLL_PROCESS_ATTACH: 11 case DLL_THREAD_ATTACH: 12 case DLL_THREAD_DETACH: 13 case DLL_PROCESS_DETACH: 14 break; 15 } 16 return TRUE; 17 }
1 // Log.cpp : 定义控制台应用程序的入口点。 2 // 3 #include <windows.h> 4 #include <iostream> 5 6 using namespace std; 7 #include "..\\__Log\\__Log.h" 8 9 #ifdef _WIN64 10 #pragma comment(lib,"..\\\\x64\\\\debug\\\\__log.lib") 11 #else 12 #pragma comment(lib,"..\\\\debug\\\\__Log.lib") 13 #endif 14 int main() 15 { 16 /* 17 int v1 = 10; 18 char* v2 = "函数错误"; 19 __Log::Instance().RecordLogEx(Warning,"%d %s",v1,v2); 20 __Log::Instance().RecordLogEx(Fatal,"%s",v2); 21 __Log::Instance().RecordLogEx(Fatal,"%s %f %f %d %s",v2,4.1,4.4,100,"HelloWorld"); 22 */ 23 24 25 //char* v1 = NULL; 26 27 28 __try 29 { 30 int a = 1; 31 a = a / 0; 32 //memcpy(v1,"HelloWorld",10); 33 34 } 35 __except(EXCEPTION_EXECUTE_HANDLER) 36 { 37 int LastError = GetLastError(); 38 __Log::Instance().RecordLogEx(Fatal,"%d %s",LastError,"继续努力"); 39 } 40 return 0; 41 }
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